| /* |
| * Copyright (c) 2009, Microsoft Corporation. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along with |
| * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| * Place - Suite 330, Boston, MA 02111-1307 USA. |
| * |
| * Authors: |
| * Haiyang Zhang <haiyangz@microsoft.com> |
| * Hank Janssen <hjanssen@microsoft.com> |
| * K. Y. Srinivasan <kys@microsoft.com> |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/wait.h> |
| #include <linux/sched.h> |
| #include <linux/completion.h> |
| #include <linux/string.h> |
| #include <linux/mm.h> |
| #include <linux/delay.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/device.h> |
| #include <linux/hyperv.h> |
| #include <linux/blkdev.h> |
| #include <scsi/scsi.h> |
| #include <scsi/scsi_cmnd.h> |
| #include <scsi/scsi_host.h> |
| #include <scsi/scsi_device.h> |
| #include <scsi/scsi_tcq.h> |
| #include <scsi/scsi_eh.h> |
| #include <scsi/scsi_devinfo.h> |
| #include <scsi/scsi_dbg.h> |
| |
| /* |
| * All wire protocol details (storage protocol between the guest and the host) |
| * are consolidated here. |
| * |
| * Begin protocol definitions. |
| */ |
| |
| /* |
| * Version history: |
| * V1 Beta: 0.1 |
| * V1 RC < 2008/1/31: 1.0 |
| * V1 RC > 2008/1/31: 2.0 |
| * Win7: 4.2 |
| * Win8: 5.1 |
| * Win8.1: 6.0 |
| * Win10: 6.2 |
| */ |
| |
| #define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \ |
| (((MINOR_) & 0xff))) |
| |
| #define VMSTOR_PROTO_VERSION_WIN6 VMSTOR_PROTO_VERSION(2, 0) |
| #define VMSTOR_PROTO_VERSION_WIN7 VMSTOR_PROTO_VERSION(4, 2) |
| #define VMSTOR_PROTO_VERSION_WIN8 VMSTOR_PROTO_VERSION(5, 1) |
| #define VMSTOR_PROTO_VERSION_WIN8_1 VMSTOR_PROTO_VERSION(6, 0) |
| #define VMSTOR_PROTO_VERSION_WIN10 VMSTOR_PROTO_VERSION(6, 2) |
| |
| /* Packet structure describing virtual storage requests. */ |
| enum vstor_packet_operation { |
| VSTOR_OPERATION_COMPLETE_IO = 1, |
| VSTOR_OPERATION_REMOVE_DEVICE = 2, |
| VSTOR_OPERATION_EXECUTE_SRB = 3, |
| VSTOR_OPERATION_RESET_LUN = 4, |
| VSTOR_OPERATION_RESET_ADAPTER = 5, |
| VSTOR_OPERATION_RESET_BUS = 6, |
| VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, |
| VSTOR_OPERATION_END_INITIALIZATION = 8, |
| VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, |
| VSTOR_OPERATION_QUERY_PROPERTIES = 10, |
| VSTOR_OPERATION_ENUMERATE_BUS = 11, |
| VSTOR_OPERATION_FCHBA_DATA = 12, |
| VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13, |
| VSTOR_OPERATION_MAXIMUM = 13 |
| }; |
| |
| /* |
| * WWN packet for Fibre Channel HBA |
| */ |
| |
| struct hv_fc_wwn_packet { |
| bool primary_active; |
| u8 reserved1; |
| u8 reserved2; |
| u8 primary_port_wwn[8]; |
| u8 primary_node_wwn[8]; |
| u8 secondary_port_wwn[8]; |
| u8 secondary_node_wwn[8]; |
| }; |
| |
| |
| |
| /* |
| * SRB Flag Bits |
| */ |
| |
| #define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002 |
| #define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004 |
| #define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008 |
| #define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010 |
| #define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020 |
| #define SRB_FLAGS_DATA_IN 0x00000040 |
| #define SRB_FLAGS_DATA_OUT 0x00000080 |
| #define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000 |
| #define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT) |
| #define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100 |
| #define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200 |
| #define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400 |
| |
| /* |
| * This flag indicates the request is part of the workflow for processing a D3. |
| */ |
| #define SRB_FLAGS_D3_PROCESSING 0x00000800 |
| #define SRB_FLAGS_IS_ACTIVE 0x00010000 |
| #define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000 |
| #define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000 |
| #define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000 |
| #define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000 |
| #define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000 |
| #define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000 |
| #define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000 |
| #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000 |
| #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000 |
| |
| |
| /* |
| * Platform neutral description of a scsi request - |
| * this remains the same across the write regardless of 32/64 bit |
| * note: it's patterned off the SCSI_PASS_THROUGH structure |
| */ |
| #define STORVSC_MAX_CMD_LEN 0x10 |
| |
| #define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14 |
| #define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12 |
| |
| #define STORVSC_SENSE_BUFFER_SIZE 0x14 |
| #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 |
| |
| /* |
| * Sense buffer size changed in win8; have a run-time |
| * variable to track the size we should use. This value will |
| * likely change during protocol negotiation but it is valid |
| * to start by assuming pre-Win8. |
| */ |
| static int sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE; |
| |
| /* |
| * The storage protocol version is determined during the |
| * initial exchange with the host. It will indicate which |
| * storage functionality is available in the host. |
| */ |
| static int vmstor_proto_version; |
| |
| struct vmscsi_win8_extension { |
| /* |
| * The following were added in Windows 8 |
| */ |
| u16 reserve; |
| u8 queue_tag; |
| u8 queue_action; |
| u32 srb_flags; |
| u32 time_out_value; |
| u32 queue_sort_ey; |
| } __packed; |
| |
| struct vmscsi_request { |
| u16 length; |
| u8 srb_status; |
| u8 scsi_status; |
| |
| u8 port_number; |
| u8 path_id; |
| u8 target_id; |
| u8 lun; |
| |
| u8 cdb_length; |
| u8 sense_info_length; |
| u8 data_in; |
| u8 reserved; |
| |
| u32 data_transfer_length; |
| |
| union { |
| u8 cdb[STORVSC_MAX_CMD_LEN]; |
| u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; |
| u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; |
| }; |
| /* |
| * The following was added in win8. |
| */ |
| struct vmscsi_win8_extension win8_extension; |
| |
| } __attribute((packed)); |
| |
| |
| /* |
| * The size of the vmscsi_request has changed in win8. The |
| * additional size is because of new elements added to the |
| * structure. These elements are valid only when we are talking |
| * to a win8 host. |
| * Track the correction to size we need to apply. This value |
| * will likely change during protocol negotiation but it is |
| * valid to start by assuming pre-Win8. |
| */ |
| static int vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); |
| |
| /* |
| * The list of storage protocols in order of preference. |
| */ |
| struct vmstor_protocol { |
| int protocol_version; |
| int sense_buffer_size; |
| int vmscsi_size_delta; |
| }; |
| |
| |
| static const struct vmstor_protocol vmstor_protocols[] = { |
| { |
| VMSTOR_PROTO_VERSION_WIN10, |
| POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, |
| 0 |
| }, |
| { |
| VMSTOR_PROTO_VERSION_WIN8_1, |
| POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, |
| 0 |
| }, |
| { |
| VMSTOR_PROTO_VERSION_WIN8, |
| POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, |
| 0 |
| }, |
| { |
| VMSTOR_PROTO_VERSION_WIN7, |
| PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, |
| sizeof(struct vmscsi_win8_extension), |
| }, |
| { |
| VMSTOR_PROTO_VERSION_WIN6, |
| PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, |
| sizeof(struct vmscsi_win8_extension), |
| } |
| }; |
| |
| |
| /* |
| * This structure is sent during the intialization phase to get the different |
| * properties of the channel. |
| */ |
| |
| #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 |
| |
| struct vmstorage_channel_properties { |
| u32 reserved; |
| u16 max_channel_cnt; |
| u16 reserved1; |
| |
| u32 flags; |
| u32 max_transfer_bytes; |
| |
| u64 reserved2; |
| } __packed; |
| |
| /* This structure is sent during the storage protocol negotiations. */ |
| struct vmstorage_protocol_version { |
| /* Major (MSW) and minor (LSW) version numbers. */ |
| u16 major_minor; |
| |
| /* |
| * Revision number is auto-incremented whenever this file is changed |
| * (See FILL_VMSTOR_REVISION macro above). Mismatch does not |
| * definitely indicate incompatibility--but it does indicate mismatched |
| * builds. |
| * This is only used on the windows side. Just set it to 0. |
| */ |
| u16 revision; |
| } __packed; |
| |
| /* Channel Property Flags */ |
| #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 |
| #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 |
| |
| struct vstor_packet { |
| /* Requested operation type */ |
| enum vstor_packet_operation operation; |
| |
| /* Flags - see below for values */ |
| u32 flags; |
| |
| /* Status of the request returned from the server side. */ |
| u32 status; |
| |
| /* Data payload area */ |
| union { |
| /* |
| * Structure used to forward SCSI commands from the |
| * client to the server. |
| */ |
| struct vmscsi_request vm_srb; |
| |
| /* Structure used to query channel properties. */ |
| struct vmstorage_channel_properties storage_channel_properties; |
| |
| /* Used during version negotiations. */ |
| struct vmstorage_protocol_version version; |
| |
| /* Fibre channel address packet */ |
| struct hv_fc_wwn_packet wwn_packet; |
| |
| /* Number of sub-channels to create */ |
| u16 sub_channel_count; |
| |
| /* This will be the maximum of the union members */ |
| u8 buffer[0x34]; |
| }; |
| } __packed; |
| |
| /* |
| * Packet Flags: |
| * |
| * This flag indicates that the server should send back a completion for this |
| * packet. |
| */ |
| |
| #define REQUEST_COMPLETION_FLAG 0x1 |
| |
| /* Matches Windows-end */ |
| enum storvsc_request_type { |
| WRITE_TYPE = 0, |
| READ_TYPE, |
| UNKNOWN_TYPE, |
| }; |
| |
| /* |
| * SRB status codes and masks; a subset of the codes used here. |
| */ |
| |
| #define SRB_STATUS_AUTOSENSE_VALID 0x80 |
| #define SRB_STATUS_INVALID_LUN 0x20 |
| #define SRB_STATUS_SUCCESS 0x01 |
| #define SRB_STATUS_ABORTED 0x02 |
| #define SRB_STATUS_ERROR 0x04 |
| |
| /* |
| * This is the end of Protocol specific defines. |
| */ |
| |
| static int storvsc_ringbuffer_size = (256 * PAGE_SIZE); |
| static u32 max_outstanding_req_per_channel; |
| |
| static int storvsc_vcpus_per_sub_channel = 4; |
| |
| module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
| MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); |
| |
| module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO); |
| MODULE_PARM_DESC(vcpus_per_sub_channel, "Ratio of VCPUs to subchannels"); |
| /* |
| * Timeout in seconds for all devices managed by this driver. |
| */ |
| static int storvsc_timeout = 180; |
| |
| static int msft_blist_flags = BLIST_TRY_VPD_PAGES; |
| |
| |
| static void storvsc_on_channel_callback(void *context); |
| |
| #define STORVSC_MAX_LUNS_PER_TARGET 255 |
| #define STORVSC_MAX_TARGETS 2 |
| #define STORVSC_MAX_CHANNELS 8 |
| |
| #define STORVSC_FC_MAX_LUNS_PER_TARGET 255 |
| #define STORVSC_FC_MAX_TARGETS 128 |
| #define STORVSC_FC_MAX_CHANNELS 8 |
| |
| #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 |
| #define STORVSC_IDE_MAX_TARGETS 1 |
| #define STORVSC_IDE_MAX_CHANNELS 1 |
| |
| struct storvsc_cmd_request { |
| struct scsi_cmnd *cmd; |
| |
| unsigned int bounce_sgl_count; |
| struct scatterlist *bounce_sgl; |
| |
| struct hv_device *device; |
| |
| /* Synchronize the request/response if needed */ |
| struct completion wait_event; |
| |
| struct vmbus_channel_packet_multipage_buffer mpb; |
| struct vmbus_packet_mpb_array *payload; |
| u32 payload_sz; |
| |
| struct vstor_packet vstor_packet; |
| }; |
| |
| |
| /* A storvsc device is a device object that contains a vmbus channel */ |
| struct storvsc_device { |
| struct hv_device *device; |
| |
| bool destroy; |
| bool drain_notify; |
| bool open_sub_channel; |
| atomic_t num_outstanding_req; |
| struct Scsi_Host *host; |
| |
| wait_queue_head_t waiting_to_drain; |
| |
| /* |
| * Each unique Port/Path/Target represents 1 channel ie scsi |
| * controller. In reality, the pathid, targetid is always 0 |
| * and the port is set by us |
| */ |
| unsigned int port_number; |
| unsigned char path_id; |
| unsigned char target_id; |
| |
| /* |
| * Max I/O, the device can support. |
| */ |
| u32 max_transfer_bytes; |
| /* Used for vsc/vsp channel reset process */ |
| struct storvsc_cmd_request init_request; |
| struct storvsc_cmd_request reset_request; |
| }; |
| |
| struct hv_host_device { |
| struct hv_device *dev; |
| unsigned int port; |
| unsigned char path; |
| unsigned char target; |
| }; |
| |
| struct storvsc_scan_work { |
| struct work_struct work; |
| struct Scsi_Host *host; |
| uint lun; |
| }; |
| |
| static void storvsc_device_scan(struct work_struct *work) |
| { |
| struct storvsc_scan_work *wrk; |
| uint lun; |
| struct scsi_device *sdev; |
| |
| wrk = container_of(work, struct storvsc_scan_work, work); |
| lun = wrk->lun; |
| |
| sdev = scsi_device_lookup(wrk->host, 0, 0, lun); |
| if (!sdev) |
| goto done; |
| scsi_rescan_device(&sdev->sdev_gendev); |
| scsi_device_put(sdev); |
| |
| done: |
| kfree(wrk); |
| } |
| |
| static void storvsc_host_scan(struct work_struct *work) |
| { |
| struct storvsc_scan_work *wrk; |
| struct Scsi_Host *host; |
| struct scsi_device *sdev; |
| |
| wrk = container_of(work, struct storvsc_scan_work, work); |
| host = wrk->host; |
| |
| /* |
| * Before scanning the host, first check to see if any of the |
| * currrently known devices have been hot removed. We issue a |
| * "unit ready" command against all currently known devices. |
| * This I/O will result in an error for devices that have been |
| * removed. As part of handling the I/O error, we remove the device. |
| * |
| * When a LUN is added or removed, the host sends us a signal to |
| * scan the host. Thus we are forced to discover the LUNs that |
| * may have been removed this way. |
| */ |
| mutex_lock(&host->scan_mutex); |
| shost_for_each_device(sdev, host) |
| scsi_test_unit_ready(sdev, 1, 1, NULL); |
| mutex_unlock(&host->scan_mutex); |
| /* |
| * Now scan the host to discover LUNs that may have been added. |
| */ |
| scsi_scan_host(host); |
| |
| kfree(wrk); |
| } |
| |
| static void storvsc_remove_lun(struct work_struct *work) |
| { |
| struct storvsc_scan_work *wrk; |
| struct scsi_device *sdev; |
| |
| wrk = container_of(work, struct storvsc_scan_work, work); |
| if (!scsi_host_get(wrk->host)) |
| goto done; |
| |
| sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun); |
| |
| if (sdev) { |
| scsi_remove_device(sdev); |
| scsi_device_put(sdev); |
| } |
| scsi_host_put(wrk->host); |
| |
| done: |
| kfree(wrk); |
| } |
| |
| |
| /* |
| * We can get incoming messages from the host that are not in response to |
| * messages that we have sent out. An example of this would be messages |
| * received by the guest to notify dynamic addition/removal of LUNs. To |
| * deal with potential race conditions where the driver may be in the |
| * midst of being unloaded when we might receive an unsolicited message |
| * from the host, we have implemented a mechanism to gurantee sequential |
| * consistency: |
| * |
| * 1) Once the device is marked as being destroyed, we will fail all |
| * outgoing messages. |
| * 2) We permit incoming messages when the device is being destroyed, |
| * only to properly account for messages already sent out. |
| */ |
| |
| static inline struct storvsc_device *get_out_stor_device( |
| struct hv_device *device) |
| { |
| struct storvsc_device *stor_device; |
| |
| stor_device = hv_get_drvdata(device); |
| |
| if (stor_device && stor_device->destroy) |
| stor_device = NULL; |
| |
| return stor_device; |
| } |
| |
| |
| static inline void storvsc_wait_to_drain(struct storvsc_device *dev) |
| { |
| dev->drain_notify = true; |
| wait_event(dev->waiting_to_drain, |
| atomic_read(&dev->num_outstanding_req) == 0); |
| dev->drain_notify = false; |
| } |
| |
| static inline struct storvsc_device *get_in_stor_device( |
| struct hv_device *device) |
| { |
| struct storvsc_device *stor_device; |
| |
| stor_device = hv_get_drvdata(device); |
| |
| if (!stor_device) |
| goto get_in_err; |
| |
| /* |
| * If the device is being destroyed; allow incoming |
| * traffic only to cleanup outstanding requests. |
| */ |
| |
| if (stor_device->destroy && |
| (atomic_read(&stor_device->num_outstanding_req) == 0)) |
| stor_device = NULL; |
| |
| get_in_err: |
| return stor_device; |
| |
| } |
| |
| static void destroy_bounce_buffer(struct scatterlist *sgl, |
| unsigned int sg_count) |
| { |
| int i; |
| struct page *page_buf; |
| |
| for (i = 0; i < sg_count; i++) { |
| page_buf = sg_page((&sgl[i])); |
| if (page_buf != NULL) |
| __free_page(page_buf); |
| } |
| |
| kfree(sgl); |
| } |
| |
| static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
| { |
| int i; |
| |
| /* No need to check */ |
| if (sg_count < 2) |
| return -1; |
| |
| /* We have at least 2 sg entries */ |
| for (i = 0; i < sg_count; i++) { |
| if (i == 0) { |
| /* make sure 1st one does not have hole */ |
| if (sgl[i].offset + sgl[i].length != PAGE_SIZE) |
| return i; |
| } else if (i == sg_count - 1) { |
| /* make sure last one does not have hole */ |
| if (sgl[i].offset != 0) |
| return i; |
| } else { |
| /* make sure no hole in the middle */ |
| if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) |
| return i; |
| } |
| } |
| return -1; |
| } |
| |
| static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
| unsigned int sg_count, |
| unsigned int len, |
| int write) |
| { |
| int i; |
| int num_pages; |
| struct scatterlist *bounce_sgl; |
| struct page *page_buf; |
| unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE); |
| |
| num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; |
| |
| bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); |
| if (!bounce_sgl) |
| return NULL; |
| |
| sg_init_table(bounce_sgl, num_pages); |
| for (i = 0; i < num_pages; i++) { |
| page_buf = alloc_page(GFP_ATOMIC); |
| if (!page_buf) |
| goto cleanup; |
| sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0); |
| } |
| |
| return bounce_sgl; |
| |
| cleanup: |
| destroy_bounce_buffer(bounce_sgl, num_pages); |
| return NULL; |
| } |
| |
| /* Assume the original sgl has enough room */ |
| static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
| struct scatterlist *bounce_sgl, |
| unsigned int orig_sgl_count, |
| unsigned int bounce_sgl_count) |
| { |
| int i; |
| int j = 0; |
| unsigned long src, dest; |
| unsigned int srclen, destlen, copylen; |
| unsigned int total_copied = 0; |
| unsigned long bounce_addr = 0; |
| unsigned long dest_addr = 0; |
| unsigned long flags; |
| struct scatterlist *cur_dest_sgl; |
| struct scatterlist *cur_src_sgl; |
| |
| local_irq_save(flags); |
| cur_dest_sgl = orig_sgl; |
| cur_src_sgl = bounce_sgl; |
| for (i = 0; i < orig_sgl_count; i++) { |
| dest_addr = (unsigned long) |
| kmap_atomic(sg_page(cur_dest_sgl)) + |
| cur_dest_sgl->offset; |
| dest = dest_addr; |
| destlen = cur_dest_sgl->length; |
| |
| if (bounce_addr == 0) |
| bounce_addr = (unsigned long)kmap_atomic( |
| sg_page(cur_src_sgl)); |
| |
| while (destlen) { |
| src = bounce_addr + cur_src_sgl->offset; |
| srclen = cur_src_sgl->length - cur_src_sgl->offset; |
| |
| copylen = min(srclen, destlen); |
| memcpy((void *)dest, (void *)src, copylen); |
| |
| total_copied += copylen; |
| cur_src_sgl->offset += copylen; |
| destlen -= copylen; |
| dest += copylen; |
| |
| if (cur_src_sgl->offset == cur_src_sgl->length) { |
| /* full */ |
| kunmap_atomic((void *)bounce_addr); |
| j++; |
| |
| /* |
| * It is possible that the number of elements |
| * in the bounce buffer may not be equal to |
| * the number of elements in the original |
| * scatter list. Handle this correctly. |
| */ |
| |
| if (j == bounce_sgl_count) { |
| /* |
| * We are done; cleanup and return. |
| */ |
| kunmap_atomic((void *)(dest_addr - |
| cur_dest_sgl->offset)); |
| local_irq_restore(flags); |
| return total_copied; |
| } |
| |
| /* if we need to use another bounce buffer */ |
| if (destlen || i != orig_sgl_count - 1) { |
| cur_src_sgl = sg_next(cur_src_sgl); |
| bounce_addr = (unsigned long) |
| kmap_atomic( |
| sg_page(cur_src_sgl)); |
| } |
| } else if (destlen == 0 && i == orig_sgl_count - 1) { |
| /* unmap the last bounce that is < PAGE_SIZE */ |
| kunmap_atomic((void *)bounce_addr); |
| } |
| } |
| |
| kunmap_atomic((void *)(dest_addr - cur_dest_sgl->offset)); |
| cur_dest_sgl = sg_next(cur_dest_sgl); |
| } |
| |
| local_irq_restore(flags); |
| |
| return total_copied; |
| } |
| |
| /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ |
| static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, |
| struct scatterlist *bounce_sgl, |
| unsigned int orig_sgl_count) |
| { |
| int i; |
| int j = 0; |
| unsigned long src, dest; |
| unsigned int srclen, destlen, copylen; |
| unsigned int total_copied = 0; |
| unsigned long bounce_addr = 0; |
| unsigned long src_addr = 0; |
| unsigned long flags; |
| struct scatterlist *cur_src_sgl; |
| struct scatterlist *cur_dest_sgl; |
| |
| local_irq_save(flags); |
| |
| cur_src_sgl = orig_sgl; |
| cur_dest_sgl = bounce_sgl; |
| |
| for (i = 0; i < orig_sgl_count; i++) { |
| src_addr = (unsigned long) |
| kmap_atomic(sg_page(cur_src_sgl)) + |
| cur_src_sgl->offset; |
| src = src_addr; |
| srclen = cur_src_sgl->length; |
| |
| if (bounce_addr == 0) |
| bounce_addr = (unsigned long) |
| kmap_atomic(sg_page(cur_dest_sgl)); |
| |
| while (srclen) { |
| /* assume bounce offset always == 0 */ |
| dest = bounce_addr + cur_dest_sgl->length; |
| destlen = PAGE_SIZE - cur_dest_sgl->length; |
| |
| copylen = min(srclen, destlen); |
| memcpy((void *)dest, (void *)src, copylen); |
| |
| total_copied += copylen; |
| cur_dest_sgl->length += copylen; |
| srclen -= copylen; |
| src += copylen; |
| |
| if (cur_dest_sgl->length == PAGE_SIZE) { |
| /* full..move to next entry */ |
| kunmap_atomic((void *)bounce_addr); |
| bounce_addr = 0; |
| j++; |
| } |
| |
| /* if we need to use another bounce buffer */ |
| if (srclen && bounce_addr == 0) { |
| cur_dest_sgl = sg_next(cur_dest_sgl); |
| bounce_addr = (unsigned long) |
| kmap_atomic( |
| sg_page(cur_dest_sgl)); |
| } |
| |
| } |
| |
| kunmap_atomic((void *)(src_addr - cur_src_sgl->offset)); |
| cur_src_sgl = sg_next(cur_src_sgl); |
| } |
| |
| if (bounce_addr) |
| kunmap_atomic((void *)bounce_addr); |
| |
| local_irq_restore(flags); |
| |
| return total_copied; |
| } |
| |
| static void handle_sc_creation(struct vmbus_channel *new_sc) |
| { |
| struct hv_device *device = new_sc->primary_channel->device_obj; |
| struct storvsc_device *stor_device; |
| struct vmstorage_channel_properties props; |
| |
| stor_device = get_out_stor_device(device); |
| if (!stor_device) |
| return; |
| |
| if (stor_device->open_sub_channel == false) |
| return; |
| |
| memset(&props, 0, sizeof(struct vmstorage_channel_properties)); |
| |
| vmbus_open(new_sc, |
| storvsc_ringbuffer_size, |
| storvsc_ringbuffer_size, |
| (void *)&props, |
| sizeof(struct vmstorage_channel_properties), |
| storvsc_on_channel_callback, new_sc); |
| } |
| |
| static void handle_multichannel_storage(struct hv_device *device, int max_chns) |
| { |
| struct storvsc_device *stor_device; |
| int num_cpus = num_online_cpus(); |
| int num_sc; |
| struct storvsc_cmd_request *request; |
| struct vstor_packet *vstor_packet; |
| int ret, t; |
| |
| num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns); |
| stor_device = get_out_stor_device(device); |
| if (!stor_device) |
| return; |
| |
| request = &stor_device->init_request; |
| vstor_packet = &request->vstor_packet; |
| |
| stor_device->open_sub_channel = true; |
| /* |
| * Establish a handler for dealing with subchannels. |
| */ |
| vmbus_set_sc_create_callback(device->channel, handle_sc_creation); |
| |
| /* |
| * Check to see if sub-channels have already been created. This |
| * can happen when this driver is re-loaded after unloading. |
| */ |
| |
| if (vmbus_are_subchannels_present(device->channel)) |
| return; |
| |
| stor_device->open_sub_channel = false; |
| /* |
| * Request the host to create sub-channels. |
| */ |
| memset(request, 0, sizeof(struct storvsc_cmd_request)); |
| init_completion(&request->wait_event); |
| vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; |
| vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
| vstor_packet->sub_channel_count = num_sc; |
| |
| ret = vmbus_sendpacket(device->channel, vstor_packet, |
| (sizeof(struct vstor_packet) - |
| vmscsi_size_delta), |
| (unsigned long)request, |
| VM_PKT_DATA_INBAND, |
| VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| |
| if (ret != 0) |
| return; |
| |
| t = wait_for_completion_timeout(&request->wait_event, 10*HZ); |
| if (t == 0) |
| return; |
| |
| if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
| vstor_packet->status != 0) |
| return; |
| |
| /* |
| * Now that we created the sub-channels, invoke the check; this |
| * may trigger the callback. |
| */ |
| stor_device->open_sub_channel = true; |
| vmbus_are_subchannels_present(device->channel); |
| } |
| |
| static int storvsc_channel_init(struct hv_device *device) |
| { |
| struct storvsc_device *stor_device; |
| struct storvsc_cmd_request *request; |
| struct vstor_packet *vstor_packet; |
| int ret, t, i; |
| int max_chns; |
| bool process_sub_channels = false; |
| |
| stor_device = get_out_stor_device(device); |
| if (!stor_device) |
| return -ENODEV; |
| |
| request = &stor_device->init_request; |
| vstor_packet = &request->vstor_packet; |
| |
| /* |
| * Now, initiate the vsc/vsp initialization protocol on the open |
| * channel |
| */ |
| memset(request, 0, sizeof(struct storvsc_cmd_request)); |
| init_completion(&request->wait_event); |
| vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; |
| vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
| |
| ret = vmbus_sendpacket(device->channel, vstor_packet, |
| (sizeof(struct vstor_packet) - |
| vmscsi_size_delta), |
| (unsigned long)request, |
| VM_PKT_DATA_INBAND, |
| VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| if (ret != 0) |
| goto cleanup; |
| |
| t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
| if (t == 0) { |
| ret = -ETIMEDOUT; |
| goto cleanup; |
| } |
| |
| if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
| vstor_packet->status != 0) { |
| ret = -EINVAL; |
| goto cleanup; |
| } |
| |
| |
| for (i = 0; i < ARRAY_SIZE(vmstor_protocols); i++) { |
| /* reuse the packet for version range supported */ |
| memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
| vstor_packet->operation = |
| VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; |
| vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
| |
| vstor_packet->version.major_minor = |
| vmstor_protocols[i].protocol_version; |
| |
| /* |
| * The revision number is only used in Windows; set it to 0. |
| */ |
| vstor_packet->version.revision = 0; |
| |
| ret = vmbus_sendpacket(device->channel, vstor_packet, |
| (sizeof(struct vstor_packet) - |
| vmscsi_size_delta), |
| (unsigned long)request, |
| VM_PKT_DATA_INBAND, |
| VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| if (ret != 0) |
| goto cleanup; |
| |
| t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
| if (t == 0) { |
| ret = -ETIMEDOUT; |
| goto cleanup; |
| } |
| |
| if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO) { |
| ret = -EINVAL; |
| goto cleanup; |
| } |
| |
| if (vstor_packet->status == 0) { |
| vmstor_proto_version = |
| vmstor_protocols[i].protocol_version; |
| |
| sense_buffer_size = |
| vmstor_protocols[i].sense_buffer_size; |
| |
| vmscsi_size_delta = |
| vmstor_protocols[i].vmscsi_size_delta; |
| |
| break; |
| } |
| } |
| |
| if (vstor_packet->status != 0) { |
| ret = -EINVAL; |
| goto cleanup; |
| } |
| |
| |
| memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
| vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; |
| vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
| |
| ret = vmbus_sendpacket(device->channel, vstor_packet, |
| (sizeof(struct vstor_packet) - |
| vmscsi_size_delta), |
| (unsigned long)request, |
| VM_PKT_DATA_INBAND, |
| VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| |
| if (ret != 0) |
| goto cleanup; |
| |
| t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
| if (t == 0) { |
| ret = -ETIMEDOUT; |
| goto cleanup; |
| } |
| |
| if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
| vstor_packet->status != 0) { |
| ret = -EINVAL; |
| goto cleanup; |
| } |
| |
| /* |
| * Check to see if multi-channel support is there. |
| * Hosts that implement protocol version of 5.1 and above |
| * support multi-channel. |
| */ |
| max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; |
| if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN8) { |
| if (vstor_packet->storage_channel_properties.flags & |
| STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) |
| process_sub_channels = true; |
| } |
| stor_device->max_transfer_bytes = |
| vstor_packet->storage_channel_properties.max_transfer_bytes; |
| |
| memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
| vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; |
| vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
| |
| ret = vmbus_sendpacket(device->channel, vstor_packet, |
| (sizeof(struct vstor_packet) - |
| vmscsi_size_delta), |
| (unsigned long)request, |
| VM_PKT_DATA_INBAND, |
| VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| |
| if (ret != 0) |
| goto cleanup; |
| |
| t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
| if (t == 0) { |
| ret = -ETIMEDOUT; |
| goto cleanup; |
| } |
| |
| if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
| vstor_packet->status != 0) { |
| ret = -EINVAL; |
| goto cleanup; |
| } |
| |
| if (process_sub_channels) |
| handle_multichannel_storage(device, max_chns); |
| |
| |
| cleanup: |
| return ret; |
| } |
| |
| static void storvsc_handle_error(struct vmscsi_request *vm_srb, |
| struct scsi_cmnd *scmnd, |
| struct Scsi_Host *host, |
| u8 asc, u8 ascq) |
| { |
| struct storvsc_scan_work *wrk; |
| void (*process_err_fn)(struct work_struct *work); |
| bool do_work = false; |
| |
| switch (vm_srb->srb_status) { |
| case SRB_STATUS_ERROR: |
| /* |
| * If there is an error; offline the device since all |
| * error recovery strategies would have already been |
| * deployed on the host side. However, if the command |
| * were a pass-through command deal with it appropriately. |
| */ |
| switch (scmnd->cmnd[0]) { |
| case ATA_16: |
| case ATA_12: |
| set_host_byte(scmnd, DID_PASSTHROUGH); |
| break; |
| /* |
| * On Some Windows hosts TEST_UNIT_READY command can return |
| * SRB_STATUS_ERROR, let the upper level code deal with it |
| * based on the sense information. |
| */ |
| case TEST_UNIT_READY: |
| break; |
| default: |
| set_host_byte(scmnd, DID_TARGET_FAILURE); |
| } |
| break; |
| case SRB_STATUS_INVALID_LUN: |
| do_work = true; |
| process_err_fn = storvsc_remove_lun; |
| break; |
| case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID): |
| if ((asc == 0x2a) && (ascq == 0x9)) { |
| do_work = true; |
| process_err_fn = storvsc_device_scan; |
| /* |
| * Retry the I/O that trigerred this. |
| */ |
| set_host_byte(scmnd, DID_REQUEUE); |
| } |
| break; |
| } |
| |
| if (!do_work) |
| return; |
| |
| /* |
| * We need to schedule work to process this error; schedule it. |
| */ |
| wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); |
| if (!wrk) { |
| set_host_byte(scmnd, DID_TARGET_FAILURE); |
| return; |
| } |
| |
| wrk->host = host; |
| wrk->lun = vm_srb->lun; |
| INIT_WORK(&wrk->work, process_err_fn); |
| schedule_work(&wrk->work); |
| } |
| |
| |
| static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request) |
| { |
| struct scsi_cmnd *scmnd = cmd_request->cmd; |
| struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
| struct scsi_sense_hdr sense_hdr; |
| struct vmscsi_request *vm_srb; |
| struct Scsi_Host *host; |
| struct storvsc_device *stor_dev; |
| struct hv_device *dev = host_dev->dev; |
| u32 payload_sz = cmd_request->payload_sz; |
| void *payload = cmd_request->payload; |
| |
| stor_dev = get_in_stor_device(dev); |
| host = stor_dev->host; |
| |
| vm_srb = &cmd_request->vstor_packet.vm_srb; |
| if (cmd_request->bounce_sgl_count) { |
| if (vm_srb->data_in == READ_TYPE) |
| copy_from_bounce_buffer(scsi_sglist(scmnd), |
| cmd_request->bounce_sgl, |
| scsi_sg_count(scmnd), |
| cmd_request->bounce_sgl_count); |
| destroy_bounce_buffer(cmd_request->bounce_sgl, |
| cmd_request->bounce_sgl_count); |
| } |
| |
| scmnd->result = vm_srb->scsi_status; |
| |
| if (scmnd->result) { |
| if (scsi_normalize_sense(scmnd->sense_buffer, |
| SCSI_SENSE_BUFFERSIZE, &sense_hdr)) |
| scsi_print_sense_hdr(scmnd->device, "storvsc", |
| &sense_hdr); |
| } |
| |
| if (vm_srb->srb_status != SRB_STATUS_SUCCESS) |
| storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, |
| sense_hdr.ascq); |
| |
| scsi_set_resid(scmnd, |
| cmd_request->payload->range.len - |
| vm_srb->data_transfer_length); |
| |
| scmnd->scsi_done(scmnd); |
| |
| if (payload_sz > |
| sizeof(struct vmbus_channel_packet_multipage_buffer)) |
| kfree(payload); |
| } |
| |
| static void storvsc_on_io_completion(struct hv_device *device, |
| struct vstor_packet *vstor_packet, |
| struct storvsc_cmd_request *request) |
| { |
| struct storvsc_device *stor_device; |
| struct vstor_packet *stor_pkt; |
| |
| stor_device = hv_get_drvdata(device); |
| stor_pkt = &request->vstor_packet; |
| |
| /* |
| * The current SCSI handling on the host side does |
| * not correctly handle: |
| * INQUIRY command with page code parameter set to 0x80 |
| * MODE_SENSE command with cmd[2] == 0x1c |
| * |
| * Setup srb and scsi status so this won't be fatal. |
| * We do this so we can distinguish truly fatal failues |
| * (srb status == 0x4) and off-line the device in that case. |
| */ |
| |
| if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || |
| (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { |
| vstor_packet->vm_srb.scsi_status = 0; |
| vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
| } |
| |
| |
| /* Copy over the status...etc */ |
| stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; |
| stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; |
| stor_pkt->vm_srb.sense_info_length = |
| vstor_packet->vm_srb.sense_info_length; |
| |
| |
| if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { |
| /* CHECK_CONDITION */ |
| if (vstor_packet->vm_srb.srb_status & |
| SRB_STATUS_AUTOSENSE_VALID) { |
| /* autosense data available */ |
| |
| memcpy(request->cmd->sense_buffer, |
| vstor_packet->vm_srb.sense_data, |
| vstor_packet->vm_srb.sense_info_length); |
| |
| } |
| } |
| |
| stor_pkt->vm_srb.data_transfer_length = |
| vstor_packet->vm_srb.data_transfer_length; |
| |
| storvsc_command_completion(request); |
| |
| if (atomic_dec_and_test(&stor_device->num_outstanding_req) && |
| stor_device->drain_notify) |
| wake_up(&stor_device->waiting_to_drain); |
| |
| |
| } |
| |
| static void storvsc_on_receive(struct hv_device *device, |
| struct vstor_packet *vstor_packet, |
| struct storvsc_cmd_request *request) |
| { |
| struct storvsc_scan_work *work; |
| struct storvsc_device *stor_device; |
| |
| switch (vstor_packet->operation) { |
| case VSTOR_OPERATION_COMPLETE_IO: |
| storvsc_on_io_completion(device, vstor_packet, request); |
| break; |
| |
| case VSTOR_OPERATION_REMOVE_DEVICE: |
| case VSTOR_OPERATION_ENUMERATE_BUS: |
| stor_device = get_in_stor_device(device); |
| work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); |
| if (!work) |
| return; |
| |
| INIT_WORK(&work->work, storvsc_host_scan); |
| work->host = stor_device->host; |
| schedule_work(&work->work); |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| static void storvsc_on_channel_callback(void *context) |
| { |
| struct vmbus_channel *channel = (struct vmbus_channel *)context; |
| struct hv_device *device; |
| struct storvsc_device *stor_device; |
| u32 bytes_recvd; |
| u64 request_id; |
| unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; |
| struct storvsc_cmd_request *request; |
| int ret; |
| |
| if (channel->primary_channel != NULL) |
| device = channel->primary_channel->device_obj; |
| else |
| device = channel->device_obj; |
| |
| stor_device = get_in_stor_device(device); |
| if (!stor_device) |
| return; |
| |
| do { |
| ret = vmbus_recvpacket(channel, packet, |
| ALIGN((sizeof(struct vstor_packet) - |
| vmscsi_size_delta), 8), |
| &bytes_recvd, &request_id); |
| if (ret == 0 && bytes_recvd > 0) { |
| |
| request = (struct storvsc_cmd_request *) |
| (unsigned long)request_id; |
| |
| if ((request == &stor_device->init_request) || |
| (request == &stor_device->reset_request)) { |
| |
| memcpy(&request->vstor_packet, packet, |
| (sizeof(struct vstor_packet) - |
| vmscsi_size_delta)); |
| complete(&request->wait_event); |
| } else { |
| storvsc_on_receive(device, |
| (struct vstor_packet *)packet, |
| request); |
| } |
| } else { |
| break; |
| } |
| } while (1); |
| |
| return; |
| } |
| |
| static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) |
| { |
| struct vmstorage_channel_properties props; |
| int ret; |
| |
| memset(&props, 0, sizeof(struct vmstorage_channel_properties)); |
| |
| ret = vmbus_open(device->channel, |
| ring_size, |
| ring_size, |
| (void *)&props, |
| sizeof(struct vmstorage_channel_properties), |
| storvsc_on_channel_callback, device->channel); |
| |
| if (ret != 0) |
| return ret; |
| |
| ret = storvsc_channel_init(device); |
| |
| return ret; |
| } |
| |
| static int storvsc_dev_remove(struct hv_device *device) |
| { |
| struct storvsc_device *stor_device; |
| unsigned long flags; |
| |
| stor_device = hv_get_drvdata(device); |
| |
| spin_lock_irqsave(&device->channel->inbound_lock, flags); |
| stor_device->destroy = true; |
| spin_unlock_irqrestore(&device->channel->inbound_lock, flags); |
| |
| /* |
| * At this point, all outbound traffic should be disable. We |
| * only allow inbound traffic (responses) to proceed so that |
| * outstanding requests can be completed. |
| */ |
| |
| storvsc_wait_to_drain(stor_device); |
| |
| /* |
| * Since we have already drained, we don't need to busy wait |
| * as was done in final_release_stor_device() |
| * Note that we cannot set the ext pointer to NULL until |
| * we have drained - to drain the outgoing packets, we need to |
| * allow incoming packets. |
| */ |
| spin_lock_irqsave(&device->channel->inbound_lock, flags); |
| hv_set_drvdata(device, NULL); |
| spin_unlock_irqrestore(&device->channel->inbound_lock, flags); |
| |
| /* Close the channel */ |
| vmbus_close(device->channel); |
| |
| kfree(stor_device); |
| return 0; |
| } |
| |
| static int storvsc_do_io(struct hv_device *device, |
| struct storvsc_cmd_request *request) |
| { |
| struct storvsc_device *stor_device; |
| struct vstor_packet *vstor_packet; |
| struct vmbus_channel *outgoing_channel; |
| int ret = 0; |
| |
| vstor_packet = &request->vstor_packet; |
| stor_device = get_out_stor_device(device); |
| |
| if (!stor_device) |
| return -ENODEV; |
| |
| |
| request->device = device; |
| /* |
| * Select an an appropriate channel to send the request out. |
| */ |
| |
| outgoing_channel = vmbus_get_outgoing_channel(device->channel); |
| |
| |
| vstor_packet->flags |= REQUEST_COMPLETION_FLAG; |
| |
| vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - |
| vmscsi_size_delta); |
| |
| |
| vstor_packet->vm_srb.sense_info_length = sense_buffer_size; |
| |
| |
| vstor_packet->vm_srb.data_transfer_length = |
| request->payload->range.len; |
| |
| vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; |
| |
| if (request->payload->range.len) { |
| |
| ret = vmbus_sendpacket_mpb_desc(outgoing_channel, |
| request->payload, request->payload_sz, |
| vstor_packet, |
| (sizeof(struct vstor_packet) - |
| vmscsi_size_delta), |
| (unsigned long)request); |
| } else { |
| ret = vmbus_sendpacket(outgoing_channel, vstor_packet, |
| (sizeof(struct vstor_packet) - |
| vmscsi_size_delta), |
| (unsigned long)request, |
| VM_PKT_DATA_INBAND, |
| VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| } |
| |
| if (ret != 0) |
| return ret; |
| |
| atomic_inc(&stor_device->num_outstanding_req); |
| |
| return ret; |
| } |
| |
| static int storvsc_device_configure(struct scsi_device *sdevice) |
| { |
| |
| blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
| |
| blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); |
| |
| blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); |
| |
| sdevice->no_write_same = 1; |
| |
| /* |
| * Add blist flags to permit the reading of the VPD pages even when |
| * the target may claim SPC-2 compliance. MSFT targets currently |
| * claim SPC-2 compliance while they implement post SPC-2 features. |
| * With this patch we can correctly handle WRITE_SAME_16 issues. |
| */ |
| sdevice->sdev_bflags |= msft_blist_flags; |
| |
| /* |
| * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 |
| * if the device is a MSFT virtual device. If the host is |
| * WIN10 or newer, allow write_same. |
| */ |
| if (!strncmp(sdevice->vendor, "Msft", 4)) { |
| switch (vmstor_proto_version) { |
| case VMSTOR_PROTO_VERSION_WIN8: |
| case VMSTOR_PROTO_VERSION_WIN8_1: |
| sdevice->scsi_level = SCSI_SPC_3; |
| break; |
| } |
| |
| if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10) |
| sdevice->no_write_same = 0; |
| } |
| |
| return 0; |
| } |
| |
| static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
| sector_t capacity, int *info) |
| { |
| sector_t nsect = capacity; |
| sector_t cylinders = nsect; |
| int heads, sectors_pt; |
| |
| /* |
| * We are making up these values; let us keep it simple. |
| */ |
| heads = 0xff; |
| sectors_pt = 0x3f; /* Sectors per track */ |
| sector_div(cylinders, heads * sectors_pt); |
| if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) |
| cylinders = 0xffff; |
| |
| info[0] = heads; |
| info[1] = sectors_pt; |
| info[2] = (int)cylinders; |
| |
| return 0; |
| } |
| |
| static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
| { |
| struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
| struct hv_device *device = host_dev->dev; |
| |
| struct storvsc_device *stor_device; |
| struct storvsc_cmd_request *request; |
| struct vstor_packet *vstor_packet; |
| int ret, t; |
| |
| |
| stor_device = get_out_stor_device(device); |
| if (!stor_device) |
| return FAILED; |
| |
| request = &stor_device->reset_request; |
| vstor_packet = &request->vstor_packet; |
| |
| init_completion(&request->wait_event); |
| |
| vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; |
| vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
| vstor_packet->vm_srb.path_id = stor_device->path_id; |
| |
| ret = vmbus_sendpacket(device->channel, vstor_packet, |
| (sizeof(struct vstor_packet) - |
| vmscsi_size_delta), |
| (unsigned long)&stor_device->reset_request, |
| VM_PKT_DATA_INBAND, |
| VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| if (ret != 0) |
| return FAILED; |
| |
| t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
| if (t == 0) |
| return TIMEOUT_ERROR; |
| |
| |
| /* |
| * At this point, all outstanding requests in the adapter |
| * should have been flushed out and return to us |
| * There is a potential race here where the host may be in |
| * the process of responding when we return from here. |
| * Just wait for all in-transit packets to be accounted for |
| * before we return from here. |
| */ |
| storvsc_wait_to_drain(stor_device); |
| |
| return SUCCESS; |
| } |
| |
| /* |
| * The host guarantees to respond to each command, although I/O latencies might |
| * be unbounded on Azure. Reset the timer unconditionally to give the host a |
| * chance to perform EH. |
| */ |
| static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) |
| { |
| return BLK_EH_RESET_TIMER; |
| } |
| |
| static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
| { |
| bool allowed = true; |
| u8 scsi_op = scmnd->cmnd[0]; |
| |
| switch (scsi_op) { |
| /* the host does not handle WRITE_SAME, log accident usage */ |
| case WRITE_SAME: |
| /* |
| * smartd sends this command and the host does not handle |
| * this. So, don't send it. |
| */ |
| case SET_WINDOW: |
| scmnd->result = ILLEGAL_REQUEST << 16; |
| allowed = false; |
| break; |
| default: |
| break; |
| } |
| return allowed; |
| } |
| |
| static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
| { |
| int ret; |
| struct hv_host_device *host_dev = shost_priv(host); |
| struct hv_device *dev = host_dev->dev; |
| struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); |
| int i; |
| struct scatterlist *sgl; |
| unsigned int sg_count = 0; |
| struct vmscsi_request *vm_srb; |
| struct scatterlist *cur_sgl; |
| struct vmbus_packet_mpb_array *payload; |
| u32 payload_sz; |
| u32 length; |
| |
| if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) { |
| /* |
| * On legacy hosts filter unimplemented commands. |
| * Future hosts are expected to correctly handle |
| * unsupported commands. Furthermore, it is |
| * possible that some of the currently |
| * unsupported commands maybe supported in |
| * future versions of the host. |
| */ |
| if (!storvsc_scsi_cmd_ok(scmnd)) { |
| scmnd->scsi_done(scmnd); |
| return 0; |
| } |
| } |
| |
| /* Setup the cmd request */ |
| cmd_request->cmd = scmnd; |
| |
| vm_srb = &cmd_request->vstor_packet.vm_srb; |
| vm_srb->win8_extension.time_out_value = 60; |
| |
| vm_srb->win8_extension.srb_flags |= |
| (SRB_FLAGS_QUEUE_ACTION_ENABLE | |
| SRB_FLAGS_DISABLE_SYNCH_TRANSFER); |
| |
| /* Build the SRB */ |
| switch (scmnd->sc_data_direction) { |
| case DMA_TO_DEVICE: |
| vm_srb->data_in = WRITE_TYPE; |
| vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; |
| break; |
| case DMA_FROM_DEVICE: |
| vm_srb->data_in = READ_TYPE; |
| vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; |
| break; |
| case DMA_NONE: |
| vm_srb->data_in = UNKNOWN_TYPE; |
| vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER; |
| break; |
| default: |
| /* |
| * This is DMA_BIDIRECTIONAL or something else we are never |
| * supposed to see here. |
| */ |
| WARN(1, "Unexpected data direction: %d\n", |
| scmnd->sc_data_direction); |
| return -EINVAL; |
| } |
| |
| |
| vm_srb->port_number = host_dev->port; |
| vm_srb->path_id = scmnd->device->channel; |
| vm_srb->target_id = scmnd->device->id; |
| vm_srb->lun = scmnd->device->lun; |
| |
| vm_srb->cdb_length = scmnd->cmd_len; |
| |
| memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); |
| |
| sgl = (struct scatterlist *)scsi_sglist(scmnd); |
| sg_count = scsi_sg_count(scmnd); |
| |
| length = scsi_bufflen(scmnd); |
| payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb; |
| payload_sz = sizeof(cmd_request->mpb); |
| |
| if (sg_count) { |
| /* check if we need to bounce the sgl */ |
| if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { |
| cmd_request->bounce_sgl = |
| create_bounce_buffer(sgl, sg_count, |
| length, |
| vm_srb->data_in); |
| if (!cmd_request->bounce_sgl) |
| return SCSI_MLQUEUE_HOST_BUSY; |
| |
| cmd_request->bounce_sgl_count = |
| ALIGN(length, PAGE_SIZE) >> PAGE_SHIFT; |
| |
| if (vm_srb->data_in == WRITE_TYPE) |
| copy_to_bounce_buffer(sgl, |
| cmd_request->bounce_sgl, sg_count); |
| |
| sgl = cmd_request->bounce_sgl; |
| sg_count = cmd_request->bounce_sgl_count; |
| } |
| |
| |
| if (sg_count > MAX_PAGE_BUFFER_COUNT) { |
| |
| payload_sz = (sg_count * sizeof(void *) + |
| sizeof(struct vmbus_packet_mpb_array)); |
| payload = kmalloc(payload_sz, GFP_ATOMIC); |
| if (!payload) { |
| if (cmd_request->bounce_sgl_count) |
| destroy_bounce_buffer( |
| cmd_request->bounce_sgl, |
| cmd_request->bounce_sgl_count); |
| |
| return SCSI_MLQUEUE_DEVICE_BUSY; |
| } |
| } |
| |
| payload->range.len = length; |
| payload->range.offset = sgl[0].offset; |
| |
| cur_sgl = sgl; |
| for (i = 0; i < sg_count; i++) { |
| payload->range.pfn_array[i] = |
| page_to_pfn(sg_page((cur_sgl))); |
| cur_sgl = sg_next(cur_sgl); |
| } |
| |
| } else if (scsi_sglist(scmnd)) { |
| payload->range.len = length; |
| payload->range.offset = |
| virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
| payload->range.pfn_array[0] = |
| virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
| } |
| |
| cmd_request->payload = payload; |
| cmd_request->payload_sz = payload_sz; |
| |
| /* Invokes the vsc to start an IO */ |
| ret = storvsc_do_io(dev, cmd_request); |
| |
| if (ret == -EAGAIN) { |
| /* no more space */ |
| |
| if (cmd_request->bounce_sgl_count) |
| destroy_bounce_buffer(cmd_request->bounce_sgl, |
| cmd_request->bounce_sgl_count); |
| |
| return SCSI_MLQUEUE_DEVICE_BUSY; |
| } |
| |
| return 0; |
| } |
| |
| static struct scsi_host_template scsi_driver = { |
| .module = THIS_MODULE, |
| .name = "storvsc_host_t", |
| .cmd_size = sizeof(struct storvsc_cmd_request), |
| .bios_param = storvsc_get_chs, |
| .queuecommand = storvsc_queuecommand, |
| .eh_host_reset_handler = storvsc_host_reset_handler, |
| .proc_name = "storvsc_host", |
| .eh_timed_out = storvsc_eh_timed_out, |
| .slave_configure = storvsc_device_configure, |
| .cmd_per_lun = 255, |
| .this_id = -1, |
| .use_clustering = ENABLE_CLUSTERING, |
| /* Make sure we dont get a sg segment crosses a page boundary */ |
| .dma_boundary = PAGE_SIZE-1, |
| .no_write_same = 1, |
| }; |
| |
| enum { |
| SCSI_GUID, |
| IDE_GUID, |
| SFC_GUID, |
| }; |
| |
| static const struct hv_vmbus_device_id id_table[] = { |
| /* SCSI guid */ |
| { HV_SCSI_GUID, |
| .driver_data = SCSI_GUID |
| }, |
| /* IDE guid */ |
| { HV_IDE_GUID, |
| .driver_data = IDE_GUID |
| }, |
| /* Fibre Channel GUID */ |
| { |
| HV_SYNTHFC_GUID, |
| .driver_data = SFC_GUID |
| }, |
| { }, |
| }; |
| |
| MODULE_DEVICE_TABLE(vmbus, id_table); |
| |
| static int storvsc_probe(struct hv_device *device, |
| const struct hv_vmbus_device_id *dev_id) |
| { |
| int ret; |
| int num_cpus = num_online_cpus(); |
| struct Scsi_Host *host; |
| struct hv_host_device *host_dev; |
| bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
| int target = 0; |
| struct storvsc_device *stor_device; |
| int max_luns_per_target; |
| int max_targets; |
| int max_channels; |
| int max_sub_channels = 0; |
| |
| /* |
| * Based on the windows host we are running on, |
| * set state to properly communicate with the host. |
| */ |
| |
| if (vmbus_proto_version < VERSION_WIN8) { |
| max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET; |
| max_targets = STORVSC_IDE_MAX_TARGETS; |
| max_channels = STORVSC_IDE_MAX_CHANNELS; |
| } else { |
| max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET; |
| max_targets = STORVSC_MAX_TARGETS; |
| max_channels = STORVSC_MAX_CHANNELS; |
| /* |
| * On Windows8 and above, we support sub-channels for storage. |
| * The number of sub-channels offerred is based on the number of |
| * VCPUs in the guest. |
| */ |
| max_sub_channels = (num_cpus / storvsc_vcpus_per_sub_channel); |
| } |
| |
| scsi_driver.can_queue = (max_outstanding_req_per_channel * |
| (max_sub_channels + 1)); |
| |
| host = scsi_host_alloc(&scsi_driver, |
| sizeof(struct hv_host_device)); |
| if (!host) |
| return -ENOMEM; |
| |
| host_dev = shost_priv(host); |
| memset(host_dev, 0, sizeof(struct hv_host_device)); |
| |
| host_dev->port = host->host_no; |
| host_dev->dev = device; |
| |
| |
| stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
| if (!stor_device) { |
| ret = -ENOMEM; |
| goto err_out0; |
| } |
| |
| stor_device->destroy = false; |
| stor_device->open_sub_channel = false; |
| init_waitqueue_head(&stor_device->waiting_to_drain); |
| stor_device->device = device; |
| stor_device->host = host; |
| hv_set_drvdata(device, stor_device); |
| |
| stor_device->port_number = host->host_no; |
| ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); |
| if (ret) |
| goto err_out1; |
| |
| host_dev->path = stor_device->path_id; |
| host_dev->target = stor_device->target_id; |
| |
| switch (dev_id->driver_data) { |
| case SFC_GUID: |
| host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; |
| host->max_id = STORVSC_FC_MAX_TARGETS; |
| host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; |
| break; |
| |
| case SCSI_GUID: |
| host->max_lun = max_luns_per_target; |
| host->max_id = max_targets; |
| host->max_channel = max_channels - 1; |
| break; |
| |
| default: |
| host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; |
| host->max_id = STORVSC_IDE_MAX_TARGETS; |
| host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; |
| break; |
| } |
| /* max cmd length */ |
| host->max_cmd_len = STORVSC_MAX_CMD_LEN; |
| |
| /* |
| * set the table size based on the info we got |
| * from the host. |
| */ |
| host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT); |
| |
| /* Register the HBA and start the scsi bus scan */ |
| ret = scsi_add_host(host, &device->device); |
| if (ret != 0) |
| goto err_out2; |
| |
| if (!dev_is_ide) { |
| scsi_scan_host(host); |
| } else { |
| target = (device->dev_instance.b[5] << 8 | |
| device->dev_instance.b[4]); |
| ret = scsi_add_device(host, 0, target, 0); |
| if (ret) { |
| scsi_remove_host(host); |
| goto err_out2; |
| } |
| } |
| return 0; |
| |
| err_out2: |
| /* |
| * Once we have connected with the host, we would need to |
| * to invoke storvsc_dev_remove() to rollback this state and |
| * this call also frees up the stor_device; hence the jump around |
| * err_out1 label. |
| */ |
| storvsc_dev_remove(device); |
| goto err_out0; |
| |
| err_out1: |
| kfree(stor_device); |
| |
| err_out0: |
| scsi_host_put(host); |
| return ret; |
| } |
| |
| static int storvsc_remove(struct hv_device *dev) |
| { |
| struct storvsc_device *stor_device = hv_get_drvdata(dev); |
| struct Scsi_Host *host = stor_device->host; |
| |
| scsi_remove_host(host); |
| storvsc_dev_remove(dev); |
| scsi_host_put(host); |
| |
| return 0; |
| } |
| |
| static struct hv_driver storvsc_drv = { |
| .name = KBUILD_MODNAME, |
| .id_table = id_table, |
| .probe = storvsc_probe, |
| .remove = storvsc_remove, |
| }; |
| |
| static int __init storvsc_drv_init(void) |
| { |
| |
| /* |
| * Divide the ring buffer data size (which is 1 page less |
| * than the ring buffer size since that page is reserved for |
| * the ring buffer indices) by the max request size (which is |
| * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) |
| */ |
| max_outstanding_req_per_channel = |
| ((storvsc_ringbuffer_size - PAGE_SIZE) / |
| ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + |
| sizeof(struct vstor_packet) + sizeof(u64) - |
| vmscsi_size_delta, |
| sizeof(u64))); |
| |
| return vmbus_driver_register(&storvsc_drv); |
| } |
| |
| static void __exit storvsc_drv_exit(void) |
| { |
| vmbus_driver_unregister(&storvsc_drv); |
| } |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
| module_init(storvsc_drv_init); |
| module_exit(storvsc_drv_exit); |